import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_wechat/navigatonItem/Contact.dart';
import 'package:flutter_wechat/navigatonItem/Find.dart';
import 'package:flutter_wechat/navigatonItem/message.dart';

import 'navigatonItem/Mine.dart';

void main() {
  runApp(MyApp());
  SystemUiOverlayStyle systemUiOverlayStyle = SystemUiOverlayStyle(
      statusBarColor: Colors.transparent,
      statusBarBrightness: Brightness.dark);
  SystemChrome.setSystemUIOverlayStyle(systemUiOverlayStyle);
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {

  List<String> navigationIcons = [
    "assets/images/message.png",
    "assets/images/contact.png",
    "assets/images/find.png",
    "assets/images/mine.png",
  ];
  List<String> labels = ["微信", "通讯录", "发现", "我的"];

  int tabIndex = 0;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      bottomNavigationBar: BottomNavigationBar(
        type: BottomNavigationBarType.fixed,
        currentIndex: tabIndex,
        fixedColor: Colors.green,
        selectedFontSize: 13,
        unselectedFontSize: 13,
        items: List.generate(
            navigationIcons.length,
            (index) => buildBottomNavigationBarItem(
                navigationIcons[index], 25, Colors.green, labels[index])),
        onTap: (index) {
          setState(() {
            tabIndex = index;
          });
        },
      ),
      body: IndexedStack(
        index: tabIndex,
        children: [
          message(),
          Contact(),
          Find(),
          Mine(),
        ],
      ),
    );
  }

  BottomNavigationBarItem buildBottomNavigationBarItem(
      String icon, double width, Color activeColor, String label) {
    return BottomNavigationBarItem(
      activeIcon: Image.asset(
        icon,
        width: width,
        color: activeColor,
      ),
      icon: Image.asset(
        icon,
        width: width,
      ),
      label: label,
    );
  }
}
